AWWA JAW58396

Many treatment process upgrades nationwide are implementedwithout looking at how the changes will affect the disinfectantresiduals in the distribution system. This article showsthat filtration and oxidation processes can significantly affect thechloramine residual in the distribution system. Therefore, changes tofiltration and oxidation at the treatment plant should be carefullyevaluated for their effect on chloramine secondary disinfectant. Themain premise is to minimize chloramine demand and decay in waterleaving the plant through appropriate treatment options so that stablecombined chlorine residual is developed for the distribution system.Many utilities are moving toward chloramines to complywith Stage 2 of the Disinfectants/Disinfection ByproductsRule. The tendency in the United States has been towardhigher doses of chloramines to provide a detectable residual indistribution systems, but it may be possible with simple treatmentchanges to lower these doses and provide better customersatisfaction. The authors provide examples of a simpletest that utility personnel can perform to better understand thecharacteristics of chloramines throughout the treatmentprocess. Includes 39 references, figures.

Product Details

Edition:

Vol. 95 - No. 7

Published:

07/01/2003

Number of Pages:

13

File Size:

1 file , 200 KB